Paper bag



J. A. ROSMAIT Aug 1, 1933 PAPER BAG Original Filed June 5, 19:51

2 Sheets-Sheet l I INVENTOR. /chn A. P05712016 ATTORNEYS Aug. 1, 1933.. J. A. ROSMAIT 1,920,322

' PAPER BAG Original Filed June 5, 1931 2 Sheets-Sheet 2 INVENTOR.

(JO/7r? Fosmaz't ATTORNEYS.

UNITED STATES PATENT OFFICE PAPER BAG John A. Rosmait, Manistee, Mich., assignor to Filer Fibre Company, Filer City, Mich., a Corporation of Michigan Application June 5, 1931, Serial No. 542,223 Renewed October 3, 1932 8 Claims. (Cl. 229-62) My invention relates to improvements in'paper Fig.9 is an elevation of an end fragment of 9. bags and their closures and their method of bag structure similar to that shown in Fig. 6. manufacture. This particular invention is preferably em- An object is to provide an inexpensive paper bodied in a single wall bag or, at most, a double bag capable of being sealed at both ends so that wall bag. It is not readily adaptable to a multi- 0 the bag may serve as a container for powdered ple wall bag having many plies and wherein gusmaterials. seted portions are used. This is because one side Another object is to provide such a bag having wall is folded over the other at the end, and if a closure at each end which employs a line of the bag were of the y p y yp ted it 10 stitching to secure the side Walls of the bag tow uld furnish t a y plies to be sat s a t ily 65 gether and a sealer strip adapted to seal the end sewe throughof the bag and to also seal the perforations pro- Figs. 1- inclusive illustrate a preferred form duced by the stitching. of my invention. In this form of the invention A meritorious feature resides in the provision of the bag illustrated is a single wall s Provided such a bag wherein one side wall extends beyond with gussets. Side wall is extended at one end the other at each end and is folded over such end y d t pp s W Of the a This PP and onto the opposite side wall and is em l d site side wall is extended at the opposite end as in combination with a sealer strip arranged with at 24 b y d side Wall 0. These d extensions respect thereto so as to seal the end of the bag, to are adapted to b folded over t adj mouth 20 serve as a reinforcement for the stitching, and to of the ag O to the opposite side walls and there seal the perforations produced by the stitching. secured in place It l be noted that in this Another object of my invention is to provide a construction the extensions 22 and 24 are of a paper bag formed of a tubul r br wherein width equal to the exposed side walls not includthere is practically no waste of paper in cutting s the gussets 25 the bag lengths and yet wherein the bag structure If the bag is of the p d form One end is is of such a character that the closure at each end Completely finished and the b is filled and then is effective to permit the use of the bag as a conthe Opposite end is fi In either event, if tainer for powdered material, the bag is of the open end form or of the valve A further object is the provision of an improved type, the tWO ends of the bag are ed alike- 30 process adaptable for use in the manufacture of In the construction shown in Figsthe Xt paper bags according to the emb t f-my sions 22 and 24 are folded over the ends of the invention. bags as illustrated in Fig. 3. There is provided,

Other objects and advantages of my invention however, a sealer strip This sealer strip is will more fully appear from th f ll i speciinserted underneath the folded over end adjacent 35 fication, appended claim nd accompanying the side wall it overlies and is secured in place drawings, wherein: v by the stitching 28 which secures the side walls Fig. 1 is a perspective of a gu t d t b bag of the bag together at the end. This sealer strip blank. is provided with lines of adhesive 30 on opposite Fig. 2 is a side elevation of bag structure sides adjacent each longitudinal margin so that 40 bodying my invention. it is adhered both to the adjacent side wall of Fig. 3 is a fragmentary sectional elevation of the bag and to the folded over pc'rtioh of the t bag Structure Shown in Fig posite side wall on both sides of the stitching 28,

Fig. 4 is a horizontal sectional view through t the adhesive does not expend y the the bag structure Shown in Fjgs 2 and 3 taken stitched portion of the sealer strip. Th1s sealer along the line of the seam strip is of a width which permits it, as shown in Figs. 2 and 3, to be folded over upon itself and f fii g g' fiifizg g ggig fi g gi i of over the end of the bag and secured to the oppo- Fi 6 site side wall of the bag by adhesive below the 15 an elevation of the bag embodymg my line of stitching on such opposite side Wall.

50 ilivention of a modified f as compared with The arrangement of the adhesive on the sealer i strip is shown in' Fig. 2 where it will be seen that ls. 7 is a f a y nd view, a y in s theportion of the sealer strip which is adapted 301011, of a single We beg being of a modified form. to be folded over is provided with a line of ad- Fig. 8 is an end view of a double wall gusseted hesive adjacent its linear margin and with the 55 bag blank. parallel spaced apart lines of adhesive extended 9 transversely of the strip from said linear line of adhesive to the line of adhesive adjacent the line on which the strip is stitched down. When the sealer strip is folded over as shown in Fig. 3 it will appear that it is adhesively secured on both sides of the bag to both side walls thereof and also to both sides of the folded portion of the one side wall and that the adhesive material is so arranged that any powdered material contents of the bag which might leak out of the apertures formed by the stitching will be prevented from escaping and will be held within bulkhead portions formed by the blocks of adhesive carried by the sealer strip.

It is also apparent that the adhesive strip serves as a reinforcement strip to take the strain of the stitching. It will be noted that the stitching is of a chain stitch type on one side of the bag and is plain stitching on the opposite side of the bag and that the sealer strip serves as a reinforcement on the plain stitch side of the bag.

The sealer strip is of a length equal to the width of the bag wall but the stitching extends in a thread end beyond the edge of the bag wall and this projecting end of the thread is sealed against unravelling by being turned into the gussets at the opposite edges of the bag, as shown in Fig. 4, and adhesively secured in place therein as described in a copending application of even date.

In Fig. 5 I have shown a bag blank which is not of the gusseted form but wherein the side walls project as described in connection with Fig. 1.

In Figs. 6 and 9 a modified form of my invention is shown wherein the sealer strip, instead of being inserted underneath the folded over end of one bag wall and adhesively secured between said folded over end and the adjacent wall of the bag, is secured to the outer surface of the folded over end of the bag wall as shown in Fig. 9. In this construction the folded over end of the bag is provided with two lines of adhesive 32 arranged in parallel spaced apart relationship to be disposed on opposite sides of the line of stitching. The sealer strip is then folded upon itself and over the end of the bag and down the opposite side wall and it is provided with lines of adhesive 36 arranged, as has been heretofore described, in linear lines and in transverse lines and which secure the same in its folded over relationship. This is shown particularly in Fig. 6. The ends of the thread are disposed in a manner similar to that hitherto shown, or in the absence of gusseted structure, the endof the thread may be molded against the bag wall underneath the sealer strip and the sealer strip adhesively secured thereover so as to hold such end in place.

In Fig. 7 I have shown the simple form of my invention wherein the projecting side walls at each end are folded over and stitched down by a line of stitching 28 but wherein no sealer'strip is provided and adhesive is not used. In this construction the chain stitch side is on the single wall side and the plain stitching is reinforced by the folded over side wall of the bag.

It will be seen that in the forms of bags embodying my invention a tubular bag blank is first formed. The edges may be glued together as indicated at 38 to form this tubular blank. In the case of a double wall bag these glued longitudinal seams are shown at 39.

These tubular bag blanks have opposite side walls projecting at opposite ends beyond the opposed side walls as shown in Figs. 1 and 5 and by cutting the blank in this fashion from a paper tube it is apparent that there is practically no wastage of paper. In the construction shown in Fig. 5 there would not be any wastage of paper. In the construction shown in Fig. 1 the only wastage would be one-half of the gusset at each side.

This method ofmanufacture is inexpensive in the saving of paper and provides an inexpensive bag which will be effectively sealed against leakage.

Whenever the word stitching is used herein it is intended to include stapling or other securing means employed to fasten the bag walls together, and used alternately in place of the stitching and is to be so considered.

What I claim:

1. A paper bag having side walls secured together at one end by a line of stitching, one of said side walls being longer than the other and folded over the end of the bag onto the opposite side wall and secured thereto by said line of.

stitching, a sealer strip extending across said end of the bag and secured to one side wall thereof by said line of stitching, and by a line of adhesive extending parallel to the line of stitching, said sealer strip folded upon itself and over the end of the bag and adhesively secured to the opposite side wall of the bag along a line extending parallel to said line of stitching and below said line of stitching, and further adhesively secured in place by spaced apart parallel lines of adhesive extending transversely of said strip over the end of the bag between said parallel lines of adhesive forming a succession of completely enclosed bulkhead portions across the end of the bag wherein the stitching is free from adhesive.

2. A paper bag having side walls secured together at one end by a line of stitching, one of said side walls being longer than the other and folded over the end of the bag onto the opposite side wall and secured thereto by said line 'of stitching, a sealer strip extending across said end of the bag and secured to one side wall thereof by said line of stitching,- underneath the folded over end of the one side wall, said sealer strip folded upon itself over said folded over end and over the end of the bag and adhesively secured to both side walls of the bag and by a line of adhesive extending across the bag underneath and spaced from the line of stitching and further adhesively secured in place over the end of the bag by narrow spaced apart transverselines of adhesive forming a plurality of completely enclosed bulkhead portions along the line of stitching wherein the stitching'is free from adhesive.

3. A paper bag having side walls secured together at one end by a line of stitching, one of said side walls being longer than the other and folded over the end of the bag onto the opposite side wall and secured thereto by said line of stitching, a sealer strip extending across said end of the bag and secured to one side wall thereof by said line of stitching underneath the folded over end of the one side wall, said sealer strip folded upon itself over said folded over end and over the end of the bag and adhesively secured to both side walls of the bag and to the folded over end of the one side wall by a line of adhesive extending across the bag underneath and spaced from the line of stitching and by a plurality of spaced apart lines of adhesive extending transversely across the strip from-one parallel line of adhesive to the other over the end of the bag and the stitching on both sides of the bag.

4. A paper bag having side walls secured together at one end by a line of stitching, one of said side walls being longer than the other and folded over the end of the bag onto the opposite side wall and secured thereto by said line of stitching, a sealer strip extending across said end of the bag and secured to one side wall thereof by said line of stitching, said sealer strip further secured in place by adhesion to both side walls of the bag .along a line underneath and spaced from the line of stitching and to both sides of the folded over end of the one side wall and to the opposite side wall of the bag by narrow lines of adhesive extending transversely across the strip between said lines of adhesive below the stitching on both sides of the strip.

5. A paper bag having side walls one of which is longer than the other and folded over the end of the bag and down along the opposite side wall and a line of stitching securing said side walls together and securing the folded over end of the one side wall in its folded over relationship against the opposite side wall and a reinforcing sealing strip arranged between said folded over end of the one side wall and the adjacent side wall of the bag and secured thereto by said stitching and adhesively secured to the side wall and to the folded over end of the opposite side wall by a narrow line of adhesive spaced above and below said line of stitching and further adhesively secured in place by a plurality of spaced apart lines of adhesive extending transversely across the strip between lines of adhesive on opposite sides of the bag and over the stitching on both sides of the bag.

6. A paper bag having side walls secured together at one end by a line of stitching, an end closure strip secured to one side wall by said line of stitching and folded upon itself over said line of stitching and thence over the end of the bag and down over the opposite side wall and secured thereto by a line of adhesive extending parallel to and below the line of stitching on said side wall, said strip further secured in place by a line of adhesive extending transversely across each end of the strip from the line of adhesive on one side to the line of adhesive on the opposite side.

'7. A paper bag having side walls secured together at one end by a line of stitching, an end closure strip extending across the end of the bag down along each side wall over the line of stitching and secured to each side wall by a line of adhesive extending parallel to and below said line of stitching by a narrow line of adhesive extending transversely across each end of the strip connecting said parallel lines of adhesive and by additional spaced apart lines of adhesive connecting said parallel lines and arranged be tween said two end lines of adhesive.

8. A paper bag having side walls secured together at one end by a line of stitching, one of said side walls being longer than the other and folded over the end of the bag onto the opposite side wall and secured thereto by said line of stitching, a sealer strip extending across said end of the bag and secured to one side wall thereof by said line of stitching underneath the folded over end of the one side wall, said sealer strip folded upon itself over said folded-over end and over the end of the bag and adhesively secured to both side walls of the bag and by a line of adhesive extending across the bag underneath and spaced from the line of stitching.

JOHN A. ROSMAIT. 

